<!DOCTYPE html>
<html lang="en">

<head>
	<meta charset="UTF-8">
	<title>搜索框输入文字自动提示</title>
	<link rel="stylesheet" href="/assets/bootstrap/dist/css/bootstrap.min.css">
	<style type="text/css">
		.container {
			padding-top: 150px;
		}
	</style>
</head>

<body>
	<div class="container">
		<div class="form-inline">
			<div class="form-group">
				<select class="form-control" id="province"></select>
			</div>
			<div class="form-group">
				<select class="form-control" id="city">
					<option>请选择城市</option>
				</select>
			</div>
			<div class="form-group">
				<select class="form-control" id="area">
					<option>请选择县城</option>
				</select>
			</div>
		</div>
	</div>
	<script src="/js/ajax.js"></script>
	<script src="/js/template-web.js"></script>
	<!-- 省份模板 -->
	<script type="text/html" id="provinceTpl">
		<option>请选择省份</option>
		{{each province}}
		<option value="{{$value.id}}">{{$value.name}}</option>
		{{/each}}
	</script>
	<!-- 城市模板 -->
	<script type="text/html" id="cityTpl">
		<option>请选择城市</option>
		{{each city}}
		<option value="{{$value.id}}">{{$value.name}}</option>
		{{/each}}
	</script>
	<!-- 县城模板 -->
	<script type="text/html" id="areaTpl">
		<option>请选择县城</option>
		{{each area}}
		<option value="{{$value.id}}">{{$value.name}}</option>
		{{/each}}
	</script>
	<script>
		// 获取省市区下拉框元素
		var province = document.getElementById('province');
		var city = document.getElementById('city');
		var area = document.getElementById('area');
		// 获取省份信息
		ajax({
			type: 'get',
			url: 'http://localhost:3000/province',
			success: function (data) {
				// 将服务器端返回的数据和html进行拼接
				var html = template('provinceTpl', {
					province: data
				});
				// 将拼接好的html字符串显示在页面中
				province.innerHTML = html;
			}
		});

		// 为省份的下拉框添加值改变事件
		province.onchange = function () {
			// 获取省份id
			var pid = this.value;

			// 清空县城下拉框中的数据
			var html = template('areaTpl', {
				area: []
			});
			area.innerHTML = html;

			// 根据省份id获取城市信息
			ajax({
				type: 'get',
				url: '/cities',
				data: {
					id: pid
				},
				success: function (data) {
					var html = template('cityTpl', {
						city: data
					});
					city.innerHTML = html;
				}
			})
		};

		// 当用户选择城市的时候
		city.onchange = function () {
			// 获取城市id
			var cid = this.value;
			// 根据城市id获取县城信息
			ajax({
				type: 'get',
				url: 'http://localhost:3000/areas',
				data: {
					id: cid
				},
				success: function (data) {
					var html = template('areaTpl', {
						area: data
					});
					area.innerHTML = html;
				}
			})
		}
	</script>
</body>

</html>